[6] Lu W C. Industrial water-use technical efficiency and potential reduction of CO₂ emissions: Evidence from industry-level data[J]. Carbon Management, 10, 513-522(2019).

[7] Murwirapachena G, Mahabir J, Mulwa R et al. Efficiency in South African Water Utilities: A Comparison of Estimates from DEA, SFA and StoNED[report]. Working Papers 780(2019).

[8] Sun B Y, Yang X H. Analysis of water resources utilization efficiency in Jilin Province based on DEA method[J]. DEStech Transactions on Computer Science and Engineering(2019).

[10] Chen Q, Ai H S, Zhang Y B et al. Marketization and water resource utilization efficiency in China[J]. Sustainable Computing: Informatics and Systems, 22, 32-43(2019).

[14] McFadden D. Cost Revenue, and Profit Functions[C]. Amsterdam: North-Holland(1978).

[15] Färe R, Jansson L. Joint inputs and the law of diminishing returns[J]. Journal of Economics, 36, 407-416(1976).

[16] Domenica M, Francesca S. Congestion analysis to evaluate the efficiency and appropriateness of hospitals in Sicily[J]. Health Policy, 119, 324-332(2015).

[19] Cooper W W, Deng H, Gu B et al. Using DEA to improve the management of congestion in Chinese industries (1981-1997)[J]. Socio-Economic Planning Sciences, 35, 227-242(2001).

[23] Wu F, Zhou P, Zhou D Q. Does there exist energy congestion? Empirical evidence from Chinese industrial sectors[J]. Energy Efficiency, 9, 371-384(2016).

[24] Färe R, Svensson L. Congestion of production factors[J]. Econometrica, 48, 1745-1753(1980).

[25] Cooper W W, Gu B S, Li S L. Comparisons and evaluations of alternative approaches to the treatment of congestion in DEA[J]. European Journal of Operational Research, 132, 62-74(2001).

[26] Flegg A T, Allen D O. Congestion in the Chinese automobile and textile industries revisited[J]. Socio-Economic Planning Sciences, 43, 177-191(2009).

[27] Wei Q L, Yan H. Weak congestion in output additive data envelopment analysis[J]. Socio-Economic Planning Sciences, 43, 40-54(2009).

[29] Färe R, Grosskopf S, Lovell C A K. The Measurement of Efficiency of Production[M]. Boston:Kluwer Nijhoff Publishing(1985).

[30] Cooper W W, Thompson R G, Thrall R M. Introduction: Extensions and new developments in DEA[J]. Annals of Operations Research, 66, 1-45(1996).

[31] Tone K, Sahoo B K. Degree of scale economies and congestion: A unified DEA approach[J]. European Journal of Operational Research, 158, 755-772(2004).

[32] Sueyoshi T, Sekitani K. DEA congestion and returns to scale under an occurrence of multiple optimal projections[J]. European Journal of Operational Research, 194, 592-607(2009).

[33] Hu J L, Wang S C. Total-factor energy efficiency of regions in China[J]. Energy Policy, 34, 3206-3217(2006).